Straw chopping device for spike picking platform of corn harvesting machine and corn harvesting machine

Abstract

The invention discloses a straw chopping device for a spike picking platform of a corn harvesting machine and the corn harvesting machine, and belongs to the technical field of agricultural machines.The straw chopping device comprises a fixed cutter unit and a movable cutter unit, the fixed cutter unit comprises a fixed cutter base, and the fixed cutter base is provided with several fixed cutterblades which are arranged in parallel; the movable cutter unit comprises a movable cutter shaft and several movable cutter sets, the movable cutter sets correspond to the fixed cutter blades one to one, each movable cutter set comprises at least movable cutter bases which are parallelly spaced in the axial direction of the movable cutter shaft and several movable cutter blades which are uniformlydistributed in the circumferential direction of the movable cutter shaft, and the movable cutter bases are welded to or integrally arranged on the movable cutter shaft; the movable cutter bases of every two adjacent movable cutter sets are distributed by a certain angle in the circumferential direction of the movable cutter shaft. The corn harvesting machine comprises the straw chopping device. According to the straw chopping device and the corn harvesting machine, the straw which needs to be chopped is subjected to full-coverage chopping, and the effect of chopping the straw is improved.

Description

technical field [0001] The invention belongs to the technical field of agricultural machinery, and in particular relates to a straw chopping device used for a corn harvester picking ear platform. In addition, the present invention also relates to a corn harvester comprising the above straw chopping device. Background technique [0002] Corn is one of the four major food crops in China and is widely planted in my country. In recent years, agricultural machinery for corn harvesting has gradually been widely used, and at the same time, the crushing and returning of corn stalks has also been widely promoted. [0003] Existing corn harvesting machines are basically divided into two categories, large and medium-sized corn harvesting machines and small corn harvesting machines. Generally, large and medium-sized corn harvesting machines have a large chassis space, and a crushing and returning device is installed between the front and rear wheels of the corn harvester (middle retur...

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Problems solved by technology

[0006] The movable knife shaft 104 is connected with the movable knife seat 106 by a spline. In order to ensure the strength of the movable knife shaft 104 and the hardness of the spline part, the movable knife shaft 104 must be processed with high-quality alloy steel after quenching and tempering heat treatment. The spline part is long (the processing length of the spline should be controlled within 150mm). After the spline part is processed, high-frequency quenching treatment is required to ensure the hardness of the spline, which will easily lead to deformation of the spline, resulting in 106 difficult to install

[0007] Due to the reasons of processing cost, processing accuracy and processing equipment, the splines of the movable knife shaft 104 are not convenient to be processed into all splines, and the movable knife seat 106 must be loaded from both ends of the movable knife shaft 104, and only two groups can be installed. That is to say, it can only be suitable for harvesting and chopping two ridges of corn stalks, and because the 104 splines of the moving knife shaft are not easy to be processed into all splines, there is a certain distance between the two sets of moving blades, and it cannot be completely cut for some lodging stalks. Overlay chopping, affecting the overall chopping effect

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